Collection and processing of bearing vibration data for their technical condition classification by machine learning methods

An experimental research facility has been developed to receive vibration signals from mechanisms with installed rolling bearings. A control block for all equipment has been created. For the repeatability of the experiment, an external microcontroller with a programmed proportional-integral-derivative regulator was used. Experiments were carried out to obtain initial data for different types of bearings. The processed data were grouped and made publicly available for further research. It is proposed to solve the problem of emergency stop of the generator, arising during operation due to bearings worn, by recognizing the pre-emergency conditions of rotary rig based on the use of advanced machine learning techniques: to highlight the signs of vibration and build clusters according to the degree of worn.

Automatic Electronic Braking System for Commercial Micro Wind Turbine

The inclusion of renewable energy as wind turbines on microgrids has been increasing in popularity. However, commercial micro wind turbines lack advance electronic control systems to monitor the turbine and automatically brake for safety purposes. This paper presents the design of a modular electronic braking and monitoring system architecture with off-the-shelf electronic components and open-source software. The proposed system records the turbine operational parameters and triggers a braking system when an emergency stop button is closed or when a desired electrical parameter exceeds an established threshold. Electronic braking is a low-cost alternative that needs less maintenance, space, and mechanical complexity. We used a 400W micro wind turbine located at 17 feet high to test the proposed system architecture. Results demonstrate that this system architecture could be implemented for wind turbines in any existing polygeneration microgrid as an add-on.

Performance Level (PL) Part I - Basic Parameter of the Machine Safety Function (SF)

The paper discusses the concept of the safety function for the machine control circuit, which is one of the basic concepts that allow to design machines in accordance with the safety requirements. The basics of the architecture of systems implementing safety functions in machines were also discussed. Using the example of the fundamental emergency stop circuit, the basics of the reliability parameters for electromechanical components are explained. The concept of forced contact guidance is also explained. The basic formulas are given and the basis for further clarification of the performance level (PL) is prepared.

Rancang Bangun Mesin CNC (Computer Numerical Control) Laser dengan Metode Design for Assembly

CNC Laser (Computer Numerical Control) adalah alat yang memiliki fungsi untuk mengukir/mencetak berbagai tulisan dan kaliqrafi secara otomatis berdasarkan media yang digunakan seperti Acrilic, Fiber, Almunium, dan kayu. Perancangan CNC laser menggunakan metode Design For Assembly Boothroyd (DFA), G-Code, dan Closed Loop System (Loop Tertutup). Kelebihan metode DFA yaitu mengestimasikan pengurangan waktu perakitan. Metode G-Code lebih ke menyatukan gerakan yang akan di lakukan mesin, seperti bergeser ke titik A, titik B. Kemudian pada metode Closed Loop System (Loop Tertutup) bekerja mengirim sinyal umpan balik ke pengendali untuk mengecilkan kesalahan sistem. Hasil pengujian dari komponen pada masing-masing alat secara keseluruhan berupa input dan output menjadi kesatuan alat mesin CNC laser cutting dan engraver. Software GRBL dihubungkan pada CNC shild. GRBL mengirim G-Code ke arduino dan menerjemahkan isi dari G-Code satu persatu untuk menghasilkan pergerakan motor stepper dan cahaya laser. Telah didapatkan sistem pengontrolan mesin laser engravir yang bisa menggerakkan mesin kearah dua sumbu X dan Y, yang tersusun dari beberapa komponen yaitu komputer, kontroler arduino nano, motor stepper, laser module, power supplay dan emergency stop. Pengujian laser engraver dilakukan dengan medium plywood dan berbagai pola gambar. Hasil pengujian menunjukkan alat dapat bekerja sesuai dengan pola gambar yang ada.CNC Laser (Computer Numerical Control) tools that have a function to automatically engrave / print various writings and kaliqrafi based on the media used such as Acrilic, Fiber, Aluminum, and wood. CNC laser design uses the Design For Assembly Boothroyd (DFA), G-Code, and Closed Loop System (Closed Loop) method. The advantage of the DFA method is that it estimates the reduced assembly time. The G-Code method is more about unifying the movements that the machine will do, such as moving from point A to point B. Then the Closed Loop System method works to send a feedback signal to the controller to minimize system errors. The test results of the components on each tool as a whole are in the form of input and output into a unity of the CNC laser cutting and engraver machine tool. GRBL software is linked to the CNC shild. The GRBL sends the G-Code to the Arduino and translates the contents of the G-Code one by one to produce stepper motor movement and laser light. A schematic of a laser engraving machine control system that is able to move the machine towards two axes X and Y, which is composed of several components, namely a computer, Arduino nano controller, stepper motor, laser module, power supply and emergency stop. Laser engraver testing was carried out using plywood and various image patterns. The test results show that the tool can work in accordance with existing image patterns.

The relationship between stress of plate-fin structures and emergency stop operation process in LNG heat exchanger

For insuring the safe operation of LNG heat exchanger in the Emergency Stop Operation Process (ESOP), a numerical method is proposed to investigate the stress of Plate-Fin Structures (PFS) in that. The relationship between stress of PFS and ESOP is analyzed in LNG heat exchanger. The results will be obtained that the maximum equivalent stress of PFS is greater at the initial stage of ESOP than that at the last stage when the HMR pressure is more than 5 MPa. The maximum equivalent stress increases with the equilibrium temperature when is greater than 180 K and reaches peak value at the last stage of ESOP. The maximum equivalent stress is larger at the last stage of ESOP than the other stage and increases with the equilibrium pressure. When the temperature difference is more than 5 K in the ESOP, the influence of that is obvious for the stress of PFS. In the ESOP, the equilibrium temperature and temperature difference should be controlled within 240 K and 5 K, respectively.

MANAGEMENT OF TRANSPORTATION AND PRODUCTION PROCESSES UNDER THE CONDITIONS OF UNPLANNED REDISTRIBUTION OF RESOURCES

Presents an algorithm and a mathematical model for controlling a technological process to minimize losses associated with an emergency in production. The conditions and features of the functioning of the technological process in the conditions of the flow method of performing work are presented. The conditions and schemes of pairing interconnected resources have been deter-mined, which allow their replacement to improve the efficiency of technological process control while observing the technology or organization of construction. Criteria are enclosed that assess the quality of the organisational-economic situation before and after the management of the tech-nological process of management. A matrix of incidents is given, which makes it possible to deter-mine the conditions of an emergency situation, to assess the loss and to make an operative decision about the compensation of these losses, which have arisen during an emergency stop of the pro-cess. The proposed model allows you to vary the parameters, change the search area to achieve the desired results. The model is invariant to the object of technological process control, which allows changing its parameters by adjusting the adjacency and incident matrices.

Control Design for Automated Vehicle Emergency Safe Stop System Based on Differential Dynamic Programming

This paper presents the control algorithm and system design for a newly proposed automated emergency stop system, which aims to navigate the vehicle out of its travel lane to a safe road-side location when an emergency (e.g. driver fails to take control during fallback of the Dynamic Driving Task) occurs. To address the unique requirements of such a system, control techniques based on differential dynamic programming are developed. Optimal control sequence computation is broken down into step-by-step quadratic optimization and solved iteratively. Control constraints are addressed efficiently by a tailored Projected-Newton algorithm. The iterative control algorithm is then integrated into a real-time control system which considers both computation delay and modeling errors. The system employs a novel grid-based storage structure for recording all acceptable control commands computed within the iteration and uses a high frequency estimator for self-localization. During operation, the real-time control thread will extract commands from the grid cell corresponding to current states. Simulation results show strong potential of the proposed system for addressing the engineering challenges of the automated emergency stop function. The robustness of the system in presence of computation time delay and modelling errors is also demonstrated.